CURRENT-VOLTAGE CHARACTERISTICS
We will present the current voltage characteristic for DC to low frequency operation of the Enhancement type
MOSFET.
Circuit Symbol
Figure 4.10
(a)
Circuit symbol for the
n
-channel
enhancement-type MOSFET.
(b)
Modified circuit
symbol with an arrowhead on the source terminal to
distinguish it from the drain and to indicate device
polarity (i.e.,
n
channel).
(c)
Simplified circuit symbol to
be used when the source is connected to the body or
when the effect of the body on device operation is
unimportant.
The i
D
-v
DS
Characteristics
Triode Region
t
GS
V
v
≥
(induced Channel)
OV
t
GS
v
V
v
≡
-
Overdrive
DS
t
GS
v
V
v
-
t
GD
V
v
⇒
(
29
-
-
=
2
2
1
'
DS
DS
t
GS
n
D
v
v
V
v
L
W
k
i
(
29
small
v
v
V
v
L
W
k
i
DS
DS
t
GS
n
D
;
'
-
=
(
29
small
v
v
L
W
k
V
v
L
W
k
r
DS
OV
n
t
GS
n
DS
;
'
1
'
1
=
-
=
Saturation Region
t
GS
V
v
≥
(induced Channel)
DS
t
GS
v
V
v
<
-
t
GD
V
v
<
⇒
(
29
2
'
2
1
t
GS
n
D
V
v
L
W
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